[time-nuts] A different timenuts interest

[Don Latham]

The Griffith Park exhibit did include a Tesla Coil. Hmmmmm...
Don

J. Forster
> How about putting a high voltage, high frequency on the bob and wire, so
> any body part that gets within say 2 feet draws giant arcs? :<))
>
> -John
>
> ===============
>
>
>> Well, I thought it was interesting that a barrier was needed at least
>> 3 feet away from the swing so that people would not grab the cable.
>>
>> Can you imagine the effect of grabbing the cable with a 250 pound bob
>> attached?
>>
>> I'd build one called "Evolution in Action." Put a Poe-like blade on
>> the bottom of the ball and omit the railing. That is, if I had the
>> money, ah, and the building. And my own country, where allowing idiots
>> to breed was illegal.
>>
>> Bill Hawkins
>>
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>> Behalf Of Bob Camp
>> Sent: Thursday, July 22, 2010 11:53 AM
>> To: 'Discussion of precise time and frequency measurement'
>> Subject: Re: [time-nuts] A different timenuts interest
>>
>> Hi
>>
>> At > $30K certainly not cheap. My guess is that the building
>> modifications
>> and permits will set you back a pretty significant chunk of money as
>> well.
>>
>> The issue of troubleshooting a 6 story high machine in a public space
>> (plus
>> insurance issues) likely makes the "proven design" a much better
>> decision
>> than a one off.
>>
>> Bob
>>
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>> Behalf Of Brooke Clarke
>> Sent: Thursday, July 22, 2010 10:38 AM
>> To: Discussion of precise time and frequency measurement
>> Cc: Morris Odell
>> Subject: Re: [time-nuts] A different timenuts interest
>>
>> Hi Morris:
>>
>> See:
>> http://www.calacademy.org/products/pendulum/pendulum_sales.html
>> http://www.calacademy.org/products/pendulum/pendspec.pdf
>> they are not cheap, but a proven design and probably lower in cost than
>> making  just one of them.
>>
>> One of these was working at Foothill College in Los Altos Hills,
>> California when I was there.  It was outside in a combined pit and
>> tower, but is not longer in use.  It needs to be somewhere inside where
>> vandals can not get to it.
>>
>> Have Fun,
>>
>> Brooke Clarke
>> http://www.PRC68.com
>>
>>
>> Morris Odell wrote:
>>> Hi all,
>>>
>>> I have been asked to help with the construction of a Foucault pendulum.
>> This
>>> is a long pendulum which oscillates in a slow stately fashion in a
>>> fixed
>>> plane which appears to move as the earth rotates. In reality the
>> surrounding
>>> environment is really moving relative to the plane of oscillation.
>>>
>>> The pendulum requires a sustaining system to compensate for the
>>> inevitable
>>> energy loss with each swing. The system is located in the building and
>>> therefore rotates relative to the pendulum. It needs to provide an
>>> impulse
>>> which does not affect the plane of oscillation of the pendulum. I was
>>> thinking of an electromagnet located below the centre of the swing
>>> which
>>> would be pulsed appropriately as the bob passes over it.
>>>
>>> Has anyone here had any experience with such a system of have any
>>> suggestions regarding the sustaining system? This is an interesting and
>>> challenging project.
>>>
>>> Cheers,
>>>
>>> Morris
>>>
>>>
>>>
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>>>
>>
>>
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>
>
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-- 
"Neither the voice of authority nor the weight of reason and argument are
as significant as experiment, for thence comes quiet to the mind."
R. Bacon


Dr. Don Latham AJ7LL
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